Ruler



FIG. 1 is a perspective view of ruler showing my design;

FIG. 2 is a top elevational view thereof;

FIG. 3 is a bottom elevational view thereof;

FIG. 4 is a left side elevational view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a front plan view thereof; and,

FIG. 7 is a rear plan view thereof. 

The ornamental design for a ruler, as shown and described. 